Canadian Climate Normals 1981-2010 Station Data

The minimum number of years used to calculate these Normals is indicated by a code for each element. A "+" beside an extreme date indicates that this date is the first occurrence of the extreme value. Values and dates in bold indicate all-time extremes for the location.

Data used in the calculation of these Normals may be subject to further quality assurance checks. This may result in minor changes to some values presented here.

Metadata including Station Name, Province, Latitude, Longitude, Elevation, Climate ID, WMO ID, TC ID
ST JOHN'S A *
NEWFOUNDLAND
Latitude: 47°37'20.000" N Longitude: 52°44'34.000" W Elevation: 140.50 m
Climate ID: 8403506 WMO ID: 71801 TC ID: YYT

* This station meets WMO standards for temperature and precipitation.

1981 to 2010 Canadian Climate Normals station data
 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Code
Temperature:
Daily Average (°C)-4.5 -4.9 -2.6 1.9 6.4 10.9 15.8 16.1 12.4 7.4 3 -1.5 5 Legend AA
Standard Deviation1.6 2.1 1.7 1.4 1.5 1.3 1.6 1.2 1.1 1.4 1.3 1.8 0.8 Legend AA
Daily Maximum (°C)-0.8 -1.1 1 5.6 11.1 15.8 20.7 20.5 16.5 10.8 6.4 1.8 9 Legend AA
Daily Minimum (°C)-8.2 -8.6 -6.1 -1.9 1.7 5.9 10.9 11.6 8.2 3.9 -0.3 -4.7 1 Legend AA
Extreme Maximum (°C)15.7 16 18.3 24.1 25.6 29.4 31.5 31 29.5 24.6 19.4 17.3   Legend
Date
(yyyy/dd)
2006/ 15 1996/ 24 1962/ 31 1986/ 24 1972/ 30 1944/ 29 1983/ 06 1996/ 07 2001/ 10 1987/ 04 1950/ 06 2008/ 13  
Extreme Minimum (°C)-23.3 -23.8 -23.8 -14.8 -6.7 -3.3 -1.1 0.5 -1.1 -5.6 -13.4 -19.7   Legend
Date
(yyyy/dd)
1957/ 29 1990/ 18 1986/ 10 1978/ 04 1964/ 05 1970/ 01 1976/ 05 1983/ 24 1950/ 23 1946/ 31 1993/ 25 1984/ 27  
Precipitation:
Rainfall (mm)66 61.6 84.8 96.1 97.9 97.5 91.6 100 129.6 153.7 124.8 102.9 1206.4 Legend AA
Snowfall (cm)88.7 71 57.3 25.3 4.4 0 0 0 0 2.4 22.4 63.4 335 Legend AA
Precipitation (mm)149.2 129.5 142.2 122.9 102.6 97.6 91.6 100 129.6 156.2 148.1 164.8 1534.2 Legend AA
Average Snow Depth (cm)18 32 22 6 0 0 0 0 0 0 1 7 7 Legend AA
Median Snow Depth (cm)15 32 19 4 0 0 0 0 0 0 0 5 6 Legend AA
Snow Depth at Month-end (cm)31 30 15 1 0 0 0 0 0 0 2 12 8 Legend AA
Extreme Daily Rainfall (mm)84.6 67.1 71.4 91.7 81.3 75.2 121.2 80.5 99.4 100.8 97.2 85.1   Legend
Date
(yyyy/dd)
1942/ 30 1973/ 22 2010/ 05 1951/ 11 1998/ 17 1945/ 24 1946/ 27 1975/ 23 2001/ 19 1942/ 04 2008/ 29 1953/ 26  
Extreme Daily Snowfall (cm)60.1 54.9 50 68.4 25.4 13.5 0 0 0.3 19.8 25.3 49.3   Legend
Date
(yyyy/dd)
2005/ 22 1959/ 15 2005/ 04 1999/ 05 1956/ 05 1959/ 10 1942/ 01 1942/ 01 1965/ 30 1965/ 29 1980/ 19 1954/ 29  
Extreme Daily Precipitation (mm)84.6 68.3 72 91.7 83.1 75.2 121.2 80.5 99.4 100.8 97.2 85.1   Legend
Date
(yyyy/dd)
1942/ 30 1973/ 22 2000/ 18 1951/ 11 1998/ 17 1945/ 24 1946/ 27 1975/ 23 2001/ 19 1942/ 04 2008/ 29 1953/ 26  
Extreme Snow Depth (cm)144 180 133 105 30 3 0 0 0 9 36 64   Legend
Date
(yyyy/dd)
2001/ 31 2001/ 09 1987/ 14 2001/ 13 2001/ 02 1968/ 10 1955/ 01 1955/ 01 1955/ 01 1991/ 29 1972/ 25 1955/ 27  
Days with Maximum Temperature:
<= 0 °C19.1 17 13.3 3.1 0.07 0 0 0 0 0 2.4 11.1 65.9 Legend AA
> 0 °C11.9 11.3 17.7 26.9 30.9 30 31 31 30 31 27.6 19.9 299.3 Legend AA
> 10 °C0.93 0.60 1.3 5.3 17.2 25.1 30.6 30.9 28.3 15.8 7.1 1.9 165.2 Legend AA
> 20 °C0 0 0 0.13 1.9 7.4 19.1 17.6 6 0.47 0 0 52.6 Legend AA
> 30 °C0 0 0 0 0 0 0.13 0.03 0 0 0 0 0.16 Legend AA
> 35 °C0 0 0 0 0 0 0 0 0 0 0 0 0 Legend AA
Days with Minimum Temperature:
> 0 °C1 1 1.6 7.1 22 29.1 31 31 29.9 26.6 13.5 4.8 198.7 Legend AA
<= 2 °C30.7 27.8 30.6 27.9 19 4.2 0.07 0.07 0.90 9.4 22.9 29 202.6 Legend AA
<= 0 °C30 27.2 29.4 22.9 9 0.90 0 0 0.07 4.4 16.5 26.2 166.6 Legend AA
< -2 °C28.1 24.9 24.5 13 2.6 0.07 0 0 0 1.5 9.8 21.1 125.7 Legend AA
< -10 °C11.3 11.8 6.8 0.40 0 0 0 0 0 0 0.10 4.6 34.9 Legend AA
< -20 °C0 0.47 0.13 0 0 0 0 0 0 0 0 0 0.60 Legend AA
< - 30 °C0 0 0 0 0 0 0 0 0 0 0 0 0 Legend AA
Days with Rainfall:
>= 0.2 mm9.3 8.6 11 13.9 15.9 14.7 13.6 13.7 15.5 18.1 15.7 12.7 162.6 Legend AA
>= 5 mm4.3 3.6 4.6 5.6 5.8 5.3 5.5 5.4 6.5 7.1 6.5 5.9 66 Legend AA
>= 10 mm2.4 2.2 3 2.9 3.2 3.2 3 3.2 4 4.6 3.8 3.6 39.1 Legend AA
>= 25 mm0.43 0.50 0.87 0.73 0.77 0.77 0.80 1.1 1.4 1.8 1.2 1.1 11.4 Legend AA
Days With Snowfall:
>= 0.2 cm18.3 14.6 13.3 7 2.1 0.07 0 0 0 1.4 7.6 14.6 78.9 Legend AA
>= 5 cm5.9 4.8 3.7 1.5 0.37 0 0 0 0 0.13 1.3 4.1 21.8 Legend AA
>= 10 cm2.6 1.8 1.6 0.67 0.07 0 0 0 0 0.07 0.57 2 9.3 Legend AA
>= 25 cm0.30 0.30 0.27 0.07 0 0 0 0 0 0 0 0.20 1.1 Legend AA
Days with Precipitation:
>= 0.2 mm21.8 18.5 19.6 17.3 16.6 14.7 13.6 13.7 15.5 18.6 19.7 22 211.7 Legend AA
>= 5 mm9.1 7.7 8.2 7.2 6 5.3 5.5 5.4 6.5 7.2 7.9 9.5 85.5 Legend AA
>= 10 mm5.3 4.5 4.7 3.7 3.4 3.2 3 3.2 4 4.7 4.7 5.8 50.3 Legend AA
>= 25 mm0.83 1 1.2 0.93 0.77 0.77 0.80 1.1 1.4 1.8 1.3 1.5 13.5 Legend AA
Days with Snow Depth:
>= 1 cm27 24.5 25.9 11.7 1 0 0 0 0 0.23 5 18.6 113.9 Legend AA
>= 5 cm21.4 21.9 20.8 6.4 0.40 0 0 0 0 0.10 2 12.7 85.8 Legend AA
>= 10 cm17.3 19.1 16.3 4.8 0.23 0 0 0 0 0 0.80 8.9 67.4 Legend AA
>= 20 cm10.4 13.2 11 2.5 0.17 0 0 0 0 0 0.03 3.9 41.2 Legend AA
Wind:
Speed (km/h)26 25 24.2 21.3 19.7 19.6 19.2 18.3 19.5 21.5 22.9 25.2 21.9 Legend AA
Most Frequent DirectionW W W W W W W W W W W W W Legend AA
Maximum Hourly Speed (km/h)120 137 121 93 101 74 67 84 97 103 105 97   Legend
Date
(yyyy/dd)
1977/ 20 1959/ 16 1956/ 15 1960/ 10 1975/ 02 1976/ 13 1979/ 06 1953/ 06 1955/ 21 1955/ 24 1955/ 27 1954/ 10  
Direction of Maximum Hourly SpeedSW N NW SW N NW SW W S W SW W N Legend
Maximum Gust Speed (km/h)167 193 193 159 146 108 107 113 153 153 161 153   Legend
Date
(yyyy/dd)
1977/ 20 1964/ 09 1956/ 15 1960/ 10 1975/ 01 1959/ 11 1977/ 23 1955/ 22 1955/ 21 1955/ 15 1955/ 27 1963/ 20  
Direction of Maximum GustSW SW NW SW N NE SE SW S NW SW S NW Legend
Days with Winds >= 52 km/h9.1 6.6 5.4 3.1 1.3 1.2 0.8 0.7 2.2 3.2 5 8.1 46.6 Legend AA
Days with Winds >= 63 km/h4.2 2.7 2.4 0.8 0.1 0.1 0.1 0.1 0.6 0.9 1.1 2.8 16.1 Legend AA
Degree Days:
Above 24 °C0 0 0 0 0 0 0 0 0 0 0 0 0 Legend AA
Above 18 °C0 0 0 0 0 1.9 17.5 16 2.6 0.1 0 0 38.1 Legend AA
Above 15 °C0 0 0 0.1 1 11.9 60 59.9 14 1.2 0 0 148.1 Legend AA
Above 10 °C0 0.2 0 1.6 14.6 64.4 183.6 189.1 84.8 17.6 3.1 0 559 Legend AA
Above 5 °C1.4 1.1 1.8 12.3 72.2 178.4 335.9 342.7 220.7 89.9 26.6 3.9 1286.9 Legend AA
Above 0 °C12.1 11.8 20.6 74.3 200.2 325.9 490.9 497.7 370.6 229.2 105.3 34.3 2373 Legend AA
Below 0 °C151.8 149.6 100.9 18.6 0.8 0 0 0 0 0.2 14.2 79.6 515.6 Legend AA
Below 5 °C296.2 280 237.1 106.6 27.7 2.5 0 0 0.1 15.9 85.5 204.2 1255.7 Legend AA
Below 10 °C449.7 420.2 390.3 246 125.1 38.5 2.7 1.4 14.2 98.6 212 355.3 2354 Legend AA
Below 15 °C604.7 561.2 545.3 394.5 266.5 136 34.2 27.2 93.4 237.2 358.9 510.3 3769.3 Legend AA
Below 18 °C697.7 645.9 638.3 484.4 358.5 216 84.6 76.3 172 329.1 448.9 603.3 4754.9 Legend AA
Bright Sunshine:
Extreme Daily8.7 10.2 11.2 13.6 15 15.5 14.9 14.2 12.9 10.3 10.1 8.5   Legend
Date
(yyyy/dd)
1994/ 31 2000/ 26 2001/ 30 1968/ 26 1971/ 30 1971/ 17 1969/ 08 1972/ 06 1999/ 02 1999/ 03 1999/ 02 2001/ 11  
Humidex:
Extreme Humidex19.2 17.3 17.2 26.1 29.5 34.8 38.5 37.7 35.8 29.8 23.7 20.7   Legend
Date
(yyyy/dd)
2006/ 15 1996/ 24 1968/ 24 1986/ 23 1988/ 26 1957/ 30 1983/ 06 1984/ 18 2001/ 10 1961/ 05 1967/ 04 2008/ 02  
Days with Humidex >= 300 0 0 0 0 0.7 4.2 3.2 0.7 0 0 0 8.8 Legend AA
Days with Humidex >= 350 0 0 0 0 0 0.4 0.3 0 0 0 0 0.7 Legend AA
Days with Humidex >= 400 0 0 0 0 0 0 0 0 0 0 0 0 Legend AA
Wind Chill:
Extreme Wind Chill-35.7 -40.3 -40.3 -21.4 -14.2 -7.6 -3.4 0 -4.4 -11.8 -24.6 -34.3   Legend
Date
(yyyy/dd)
1957/ 29 1990/ 03 1986/ 10 1994/ 03 1993/ 11 1959/ 11 1976/ 06 1953/ 01 1986/ 30 1954/ 26 1993/ 25 1984/ 27  
Days with Wind Chill < -207.6 8.1 3.5 0.1 0 0 0 0 0 0 0.1 2.7 22.2 Legend AA
Days with Wind Chill < -300.4 0.8 0.2 0 0 0 0 0 0 0 0 0.2 1.6 Legend AA
Days with Wind Chill < -400 0 0 0 0 0 0 0 0 0 0 0 0.1 Legend AA
Humidity:
Average Vapour Pressure (kPa)0.4 0.4 0.5 0.6 0.8 1.1 1.4 1.5 1.2 0.9 0.7 0.5 0.8 Legend AA
Average Relative Humidity - 0600LST (%)84.6 84 85.5 87.3 86.3 87 87.4 88.9 90 88.7 86 85.9 86.8 Legend AA
Average Relative Humidity - 1500LST (%)80.4 77.9 76.2 75.6 71.5 71.1 69.7 71.2 73.5 76.7 79.8 82.3 75.5 Legend AA
Pressure:
Average Station Pressure (kPa)99.1 99.2 99.4 99.6 99.8 99.7 99.8 99.8 99.8 99.7 99.6 99.2 99.6 Legend AA
Average Sea Level Pressure (kPa)100.9 101 101.1 101.4 101.5 101.4 101.5 101.5 101.5 101.5 101.3 100.9 101.3 Legend AA
Visibility (hours with):
< 1 km49.2 56.8 82.7 112 116.6 83.5 64 45.5 35.2 43.3 52.7 61.1 802.5 Legend CC
1 to 9 km163.6 148.2 156.5 131.5 128.1 116.5 111.5 112.8 102 114 127 149.9 1561.7 Legend CC
> 9 km531.2 473 504.9 476.4 499.4 519.9 568.5 585.7 582.8 586.7 540.4 533 6401.9 Legend CC
Cloud Amount (hours with):
0 to 2 tenths81.1 89.9 111.8 101.5 107.3 97.8 101.7 126.2 135.9 104.7 68.4 64.1 1190.4 Legend CC
3 to 7 tenths133.1 115.7 110.3 98.7 110 118 160.4 159.8 140.1 134.7 124.2 124.4 1529.3 Legend CC
8 to 10 tenths529.8 472.4 521.9 519.7 526.8 504.3 481.9 458 444 504.6 527.4 555.4 6046.3 Legend CC
1981 to 2010 Canadian Climate Normals station data (Frost-Free)
Frost-Free:Code
Average Date of Last Spring Frost May 30 LegendAA
Average Date of First Fall Frost October 17 LegendAA
Average Length of Frost-Free Period 139 Days LegendAA
Probability of last temperature in spring of 0 °C or lower on or after indicated dates 10% 25% 33% 50% 66% 75% 90%
DateJun 16Jun 09Jun 06Jun 01May 26May 23May 18
Probability of first temperature in fall of 0 °C or lower on or after indicated dates 10% 25% 33% 50% 66% 75% 90%
DateSep 28Oct 07Oct 09Oct 15Oct 18Oct 21Oct 26
Probability of frost-free period equal to or less than indicated period (Days) 10% 25% 33% 50% 66% 75% 90%
Days112123126137142146151
Legend
  • A = WMO "3 and 5 rule" (i.e. no more than 3 consecutive and no more than 5 total missing for either temperature or precipitation)
  • B = At least 25 years
  • C = At least 20 years
  • D = At least 15 years